CVE-2025-13676: JustClick registration plugin <= 0.1 - Reflected Cross-Site Scripting via PHP_SELF

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-24 · updated 2026-06-17
Weakness: CWE-79

Description

The JustClick registration plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in all versions up to, and including, 0.1. This is due to insufficient input sanitization and output escaping on the `PHP_SELF` server variable. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected products

ostin654 JustClick registration plugin: through 0.1

References

https://plugins.trac.wordpress.org/browser/justclick-subscriber/tags/0.1/justclick.php#L154
https://plugins.trac.wordpress.org/browser/justclick-subscriber/trunk/justclick.php#L154
https://www.wordfence.com/threat-intel/vulnerabilities/id/f1420ec8-55e4-448d-8230-228d1e566b97?source=cve

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